Start by whisking together the buttermilk, hot sauce, smoked paprika, garlic powder, onion powder, cayenne pepper, salt, and black pepper in a large mixing bowl.
To help the brine penetrate, poke small holes in the chicken pieces with a fork. Submerge the chicken in the brine, cover, and refrigerate for at least 4 hours. If you can marinate overnight, the flavor will be even more incredible.
In another bowl, combine the all-purpose flour, cornstarch, baking powder, kosher salt, and Italian seasoning.
The cornstarch is the game-changer here—it’s what makes the crust extra crispy. Mix everything well to ensure the seasoning is evenly distributed.
Remove the chicken from the brine and let any excess drip off. Coat each piece in the seasoned flour mixture, pressing gently to ensure a thick, even layer. For an extra-crunchy crust, add a couple of tablespoons of the brine to the flour mixture and mix it in before dredging.
Heat the oil in a cast iron skillet to 325°F. Carefully place the chicken skin-side down, frying in batches to avoid overcrowding. Cook each piece for 6-8 minutes per side, or until golden brown and the internal temperature reaches 165°F.
Once done, transfer the chicken to a wire rack to cool slightly while staying crispy.